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BSA Flow Software Installation and User's Guide - CSI

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Focal length<br />

Transmitter<br />

(Fiber<strong>Flow</strong>)<br />

Measurement<br />

volume<br />

diameter<br />

However, not only the measurement size range is influenced by these<br />

parameters, also the diameter of the measurement volume <strong>and</strong>/or the<br />

frequency/velocity conversion factor may be influenced. Therefore the<br />

optimization of the optical system may occur under conflicting constraints.<br />

To provide an aid in choosing these parameters, Table A1-2 has been<br />

prepared for st<strong>and</strong>ard DualPDA arrangements. The calculations have been<br />

performed based on a st<strong>and</strong>ard beam separation of 38 mm in a 60X61<br />

Fiber<strong>Flow</strong> probe, a scattering angle of 30° <strong>and</strong> a slit width of 100 µm in the<br />

receiving optics.<br />

Velocity<br />

conversion<br />

factor *<br />

Focal<br />

length<br />

Receiver<br />

(DualPDA)<br />

Measurement<br />

volume<br />

length **<br />

Apertur<br />

e plate<br />

Upper limit of size range<br />

[mm] [µm] [m/s/MHz] [mm] [µm] [µm]<br />

m=1.12<br />

5<br />

m=1.33<br />

4<br />

m=1.6<br />

160 78 2,1815 160 256 A 114 44 40<br />

B 150 57 52<br />

C 327 124 114<br />

400 640 A 289 109 100<br />

B 378 143 131<br />

C 820 310 284<br />

1000 1600 A 723 273 250<br />

B 946 358 327<br />

C 2050 775 709<br />

400 194 5,4219 160 256 A 303 110 100<br />

B 398 144 130<br />

C 869 312 283<br />

400 640 A 766 275 249<br />

B 1003 361 326<br />

C 2174 781 707<br />

1000 1600 A 1920 690 624<br />

B 2511 902 816<br />

C 5434 1953 1768<br />

1000 485 13,541 160 256 A 765 276 250<br />

B 1005 361 326<br />

C 2193 782 707<br />

400 640 A 1933 690 624<br />

B 2532 903 815<br />

C 5484 1956 1766<br />

1000 1600 A 4849 1727 1560<br />

B 6326 2257 2038<br />

C 13684 4887 4416<br />

* For wavelength λ = 514.5 nm.<br />

** Length of imaged slit width in the measurement volume.<br />

Table A1-2. DualPDA measurement size ranges for different optical configurations.<br />

<strong>BSA</strong> <strong>Flow</strong> <strong>Software</strong>:Reference guide 7-71

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